2,6-dichloro-4,8-dipiperidin-1-ylpyrimido[5,4-d]pyrimidine HOMOPURINE,2,6-DICHLORO,4,8-DIPIPERIDINO MFC16 H20 N6 CL2 InChI=1/C16H20Cl2N6/c17-15-20-12-11(13(21-15)23-7-3-1-4-8-23)19-16(18)22-14(12)24-9-5-2-6-10-24/h1-10H pyrimido[5,4-d]pyrimidine, 2,6-dichloro-4,8-di-1-piperidinyl-